This false-color image shows the rock "Chocolate Hills," perched on the rim of the 10-meter (33-foot) wide "Concepcion" crater.

Patches of unusual dark material can be seen on top of this rock and on several others in the scene.

The image was acquired by the Opportunity rover's panoramic camera (Pancam) on its 2144th Martian day, or sol, on Mars (Feb. 3, 2010), using several of the panoramic camera's filters (at wavelengths of 750 nanometers, 530 nanometers, and 430 nanometers).

The false-color enhancement increases the contrast between different rock and soil types on the Martian surface.